package org.myblog.myblogserver.config.interceptor;

import io.jsonwebtoken.Claims;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.myblog.myblogserver.config.GlobalConfig;
import org.myblog.myblogserver.config.properties.JwtProperties;
import org.myblog.myblogserver.context.BaseContext;
import org.myblog.myblogserver.util.JwtUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
@Slf4j
@RequiredArgsConstructor
public class JwtTokenInterceptor implements HandlerInterceptor {


    private final JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            // 当前拦截到的不是动态方法，直接放行
            return true;
        }

        // 1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        // 2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            System.out.println("claims = " + claims);
            String userId = claims.get(GlobalConfig.USER_ID).toString();
            log.info("当前用户id：{}", userId);
            // 保存用户id到线程ThreadLocal中
            BaseContext.setCurrentId(userId);
            // 3、通过，放行
            return true;
        } catch (Exception ex) {
            // 4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
